Adjustable saw frame



June 28, 1932. A. LOGA- ADJUSTABLE SAW FRAME Filed June 10, 1930 2 Sheets-Sheet 1 INVENTOfi X26 rarziarlb a ATTO NEY June 28, 1932. A. LOGA 1,865,026

ADJUSTABLE SAW FRAME Filed June 10, 1950 2 Sheets-Sheet 2 I 3% HWIHI llllllllltlfililllllllll llll ll illl ll 1H1} x INVENTOR fle wzier [ya F REY Patented June 28, 1932 UNITED STATES PATENT OFFICE ALEXANDER LOGA, F DEARBORN, MICHIGAN, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, 0F ONE-FOURTH T0 MICHAEL CIUNGAN, OF DETROIT, MICHIGAN, AND ONE-FOURTH TO JOHN PAVEL, OF DEARBOBN, MICHIGAN ADJUSTABLE SAW FRAME Application filed June 10,

This invention relates to saw frames, and particularly to adjustable saw frames.

An object of the invention is to adapt an arched saw frame to be selectively adjusted to readily receive various standard lengths of saw blades.

Another object is to mount upon a saw frame of the aforesaid type a rotatable actuator for expanding or retracting the frame,

, and to adapt one revolution of said actuator to shift the blade holders of said frame to or from each other a distance equal to that between the lengths of two standard blades.

A further object is to equip such an actuator with an element pivotally movable beto provide for securely latching said handle and parts in any of such positions.

These and various other objects the invention attains by the construction hereinafter described and illustrated in the accompanying drawings, wherein:

Fig. 1 is a view in side elevation of the improved saw frame, adjusted to receive a blade of minimum length, the latter and the saw handle being positioned in the plane of said frame.

Fig. 2 is a top plan view of the same.

Fig. 3 is a vertical cross section, taken upon the line 3-8 of Fig. 1, and primarily showing the front end of the frame.

Fig. 45 is a fragmentary elevational View,

* partially in section, of the top portionof the frame, showing pinion and rack elements of the mechanism for expanding and retracting the frame.

Fig. 5 is a side elevational view of the frame in one of its expanded positions, showing the handle and saw blade adjusted transversely to the frame.

Fig. 6 is a fragmentary sectional view, taken upon the line 66 of Fig. 2 and dis- 50 closing primarily latch means for holding 1930. Serial No. 460,216.

the rear blade holder in selective positions 2 i of rotation.

Fig. 7 is a cross sectional view of the same, taken upon the line 7-7 of Fig. 5.

Fig. 8 is a fragmentary, longitudinal cross section, taken upon the line 8-8 of Fig. 5 and primarily disclosing the actuator and a rack-engaging pinion, effecting expansion and retraction of the frame.

Fig. 9 is a cross sectional view of the same, taken upon the line 9-9 of Fig. 5.

Fig. 10 is a vertical cross section through the bars connecting the frame members, taken upon the line 101O of Fig. 1.

In these views, the reference character 1 designates a pair of spaced parallel arms forming the ends of an arched saw frame. For connecting said arms, overlapping bars 2 and 3 rigidly project from their upper ends, the bar 2 as illustrated being integral With one of said arms, and the bar 3 secured to a lug a upon the other by a pair of bolts 5. The bar 3 is of an arched construction, adapting it to straddle and encase the bar 2, and its spaced walls are connected, remote from its supported'end and beneath the bar 2, by a pin or rivet 6 or the like to maintain alignment of the two bars.

The, bar 2 is longitudinally formed with a slot 7 one edge of which forms a rack 8, as best appears in Fig. 1. Within said slot and meshing with said rack is a pinion 9 fast upon a shaft 10 journaled in one wall of the bar 3 and in a plate 11 eXteriorly secured to said wall by screws 12. Adjacent to the outer face of said plate, a crank arm 13 is secured upon a squared portion of the shaft 10 by a nut 1d, and has pivoted on its free end an elongated element 15 functioning both as a handle and a latch member for said arm. Thus, the element 15 when occupying a transverse relation to the arm 13, as best appears in Fig. 9, forms a finger grip or handle facilitating rotative actuation of said arm, and said element, when swung down upon and parallel to said arm, as best appears in Figs. 1, 2, and 8, serves to latch the arm against rotation. The latter function is secured by formation on the pivotal end of said element of a lug 16, engaging in a slot 17 of the plate,

11 when said element is parallel to said plate and disengageable from said slot by swinging said element away from said plate, as in Fig. 9. To secure the element 15 in its latch-forming position, a U-shaped keeper 18 straddles and is pivoted on the shaft-engaging end of the arm 13 whereby it may in one angular position also straddle the free end of the element 15", as in Fig. 8, but may be swung clear of said element, as F ig.-'9 illustrates.

The pinion 9 is proportioned to permit actuation of same through one revolution to relatively shift the component parts of the frame to or from each other a distance equal to the difference in length between two standard saw blades, this distance being ordinarily one inch. To definitely indicate the length of blade to be held by the frame in any of its several adjustments, a small aperture 19 is formed at some suitable point in one wall of the bar 3, and a series of numerals 8, 9, 10, 11 and 12 is so marked on a side face of the bar at 2 as to individually appear through said aperture in the different positions of adjustment of the frame, indicating the lengths of blades to be used in such positions.

Upon their lower or free ends, the arms 1 are integrally formed with a pair of aligned bearings 20, in which are rotatably and slidably mounted a pair of cylindrical blade holders 21. Exteriorly adjacent to the frame, an ordinary saw handle 22 is rigidly connected to one of said holders, the other thereof having a threaded outer end portion engaged by a clamping nut 23, preferably of the wing type. The inner ends of the holders 21 having the usual laterally flattened faces from which pins 24 project to engage apertured ends of a saw blade 25.

The lower portions of the arms 1 are similarly formed with a pair of vertical slots 26 intersecting the bearings 20 and receiving disks 27 loosely mounted on the holders 21 and integrally formed with splines 28 engaging in spline-ways 29 longitudinally extended in said holders. As best appears in Fig. 7, said disks are integrally formed with substantially semi-circular latch plates 30, each having its peripheral face formed with three radial sockets 31 spaced ninety degrees apart. Coacting with said latch elements is a pair of bolts 32, each respectively longitudinally slidable in the arms 1 and resiliently urged against said latch elements by coiled springs 33, embracing reduced upper portions of said bolts and housed within said arms. Abutments for the upper ends of said springs are formed by small plugs 34 threaded into the top faces of the arms 1, the reduced upper end portions of the bolts 32 passing slidably through said plugs and screw threaded for engagement by nuts 35, normally having a tongue and groove engagement with the plugs 34.

In use, the described saw frame is adapted to carry different lengths of standard blades by swinging the keeper 18 clear of the element 15 and then swinging the latter transversely to the crank arm 13, as shown in Fig. 9. The element 15 now serves as a handle to rotatively drive the crank arm and pinion 9 and shift the main parts of the frame to or from each other, each revolution of said arm increasing or decreasing the length of the frame exactly one inch. A desired adjustment being established, the element 15 is swung back into parallelism with the plate 11, entering the lug 16 in the slot 17 to retain the crank arm in place. The keeper 18 is now swung into engagement with the free end of said element, as Fig. 8 best discloses, to maintain the latter in latching position.

Ordinarily, a blade mounted in the described frame will lie parallel to said frame, as best appears in Fig. 1. .Vhen, however, the nature of the work renders it desirable to establish said blade in transverse relation to the frame, the bolts 32 are released from the latch plates 30 by slightly lifting the nuts 35 and turning same suflieiently to destroy their tongue and groove engagement with the plugs 34. This permits the holders 21 to be turned left or right in the bearings 20 through ninety degrees to establish the blade 25 in the desired transverse relation to the frame. It is important to note in this connection that the saw handle 22 participates in any such adjustment of the holders 21, so that said handle and the blade will always lie in a common plane of use. To maintain the changed rotative position of the holders and blade, the nuts 35 are turned to reestablish tongue and groove engagement with the plugs 34, whereupon the springs 33 will enter the bolts 32 in the registering sockets 31.

The described saw frame, while particularly suited for mounting hack saw blades, can also be advantageously used as a butchers saw, and for various other purposes. Its adaptability to receive blades of any standard length eliminates the expense of equipping oneself with a set of frames, each suited to a different length blade, and permits a workman going out on a job to meet any conditions that may be encountered without necessity of carrying a set of different saw frames, as well as corresponding lengths of blades.

The adaptability of the described frame to mount a blade transversely to the frame permits in many instances a saw cut to be formed of much greater depth than is permitted where the blade is permanently established in th plane of the frame.

\Vhile it is apparent that the illustrated embodiment of my invention is well calculated to adequately fulfill the objects and advantages primarilystated, it is to be understood that the invention is susceptible to variation, modification and change within the spirit and scope of the subjoined claims.

What I claim is 1. An arched saw frame comprising a pair of frame members formed with a pair of spaced parallel arms and with a pair of slidably overlapped bars rigidly projecting from corresponding ends of said arms, a pair of blade holders carried by the other ends of said arms, means retaining said bars in sliding engagement, one of said bars being formed with a toothed rack extending longitudinally thereof, a shaft journaled in the other of said bars, a pinion upon said shaft engaging said rack and proportioned to relatively shift the frame members a distance equal to the difference in length between two standard blades responsive to one revolution of said actuator, an actuator carried by said shaft for rotating same, and means for latching said actuator in certain position of its rotation.

2. An arched saw frame comprising a pair of frame members having substantially parallel arms and a pair of overlapped bars rigidly projecting from corresponding ends of said arms, apair of blade holders carried by the other ends of said arm, means retaining said bars in mutual sliding engagement, a toothed rack longitudinally extending on one of said bars, a pinion meshing with said rack, shaft journaled in the other of said bars and carrying said pinion, a crank arm engaging said shaft, and an element pivoted upon the free end of said crank arm coacting with said bars in one pivotal position to latch the bars in selective positions of sliding engagement, and serving as a handle for said arm in another pivotal position.

3. An arched saw frame comprising two frame members having slidably overlapped bars, a pair of coacting blade holders carried by said frame members, means maintaining sliding engagement of said bars, a toothed rack longitudinally extending on one of said bars, a pinion meshing with said rack, a shaft journaled in the other of said bars and carrying said pinion, a crank arm fast upon said shaft, and an element pivotal upon said crank arm remote from said shaft lying substantially parallel to said crank arm in one pivotal position of said element, the pivotal end of said element being formed with a projection, and the shaft-j ournaling bar being slotted to receive said projection in the specified position of said element to latch the bars against relative sliding, said element when outwardly swung from said crank arm forming a handle for turning said crank arm.

4:. The combination with a saw frame comprising a pair of spaced substantially parallel arms and a connection between corresponding ends of said arms, of a pair of aligned bearings carried by the other ends of said arms, a pair of blade holders rotative in said bearings, a pair of latch plates freely mounted upon said holders and having a tongue and groove engagement with said holders, said arms and bearings being slotted to receive said plates, and means carried by said arms coacting with said plates to maintain selective rotative positions of said holders.

5. An arched saw frame comprising a pair of frame members, formed with a pair of spaced, substantially parallel arms, and with a pair of slidably overlapped bars rigidly projecting from corresponding ends of said arms, a pair of blade holders carried by the other ends of said arms, means normally retaining said bars in sliding engagement, and an element rotatable upon one of said bars and reacting upon the other of said bars for effecting a relative sliding travel of said bars.

6. An arched saw frame comprising a pair of frame members having substantially parallel arms, and a pair of overlapped bars rigidly projecting from corresponding ends of said arms, a pair of companion blade holders carried by the ends of said arms, means normally retaining said bars in mutual sliding engagement, an element rotatable on one of said bars and reacting upon the other thereof to effect a relative sliding of said bars, a. crank arm connected to said element and a second element pivoted upon the free end of said crank arm coacting with said bars in one pivotal position to latch the bars in selective positions of sliding engagement, and serving as a handle for said arm in another pivotal position.

7 The combination with a saw frame comprising a pair of spaced, substantially parallel arms and a connection between corresponding ends of said arms, of a pair of aligned bearings carried by the other ends of said arms, apair of blade holders rotative in said bearings, a pair of latch plates mounted upon said holders to turn therewith, the

holders being slidable through said plates,

means upon said arms restraining said plates from movement relative to said arms along the aXis of saidholders, and means carried by said arms coacting with said plates to maintain selective rotative positions of said holders.

In testimony whereof I sign this specification.

ALEXANDER LOGA. 

